Analog Devices Inc./Maxim Integrated MAX6385XS44D7-T

Overview

MAX6385XS44D7-T from Maxim Integrated is a precision active-high push-pull μP supervisory circuit designed to monitor +4.38V supply voltage with ±2.5% threshold accuracy over -40°C to +125°C, provide 1200ms minimum VCC reset timeout and 150ms manual reset timeout, and operate down to VCC = 1.0V - used in battery-powered controllers and portable instrumentation for reliable power-on reset assertion.

For engineers reviewing the MAX6385XS44D7-T datasheet, MAX6385XS44D7-T pinout, MAX6385XS44D7-T application, or MAX6385XS44D7-T equivalent, key selection criteria include its factory-set 4.38V reset threshold, dual timeout timing (1200ms/150ms), 4-pin SC70 package, active-high push-pull output, and integrated debounced manual reset input with internal pullup.

Technical Context

The MAX6385XS44D7-T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and guarantees valid reset state down to VCC = 1.0V. Its internal timer enforces a fixed 1200ms minimum timeout after VCC recovery and a separate 150ms timeout after manual reset release.

It features an active-high push-pull RESET output capable of sourcing 800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC, and includes a debounced MR input with 100ns glitch rejection and 1µs minimum pulse width requirement - all within a 4-pin SC70 footprint.

Key Specifications

Pinout & Package

MAX6385XS44D7-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, with thermal resistance θJA = 322.6°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar μP reset applications.

Compared with MAX6385XS44D7-T, the MAX6385XS44D4-T offers identical functionality with reduced timeout durations, while TPS3808G33DBVR provides lower-cost supervision at a fixed 3.3V threshold but omits manual reset capability and requires PCB rework.

Availability

MAX6385XS44D7-T is available at Aetrix Electronics and suitable for industrial controller supervision, battery-powered instrumentation, automotive body control modules, and medical wearable sensor nodes requiring stable component supply across extended temperature ranges.

Supply support for MAX6385XS44D7-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and medical applications.

The MAX6381–MAX6390 family delivers ultra-low-power, AEC-Q100–qualified μP supervisors with factory-trimmed thresholds and multiple timeout options for robust power monitoring in space-constrained systems.

FAQ

What is the exact reset threshold voltage of the MAX6385XS44D7-T?

The MAX6385XS44D7-T has a factory-set nominal reset threshold of 4.38V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "44" corresponds to VTH(nom) = 4.38V, VTH(min) = 4.27V, and VTH(max) = 4.48V. The MAX6385XS44D7-T uses this precise threshold to supervise 4.5V logic rails in industrial and automotive systems.

Does the MAX6385XS44D7-T support manual reset functionality?

Yes, the MAX6385XS44D7-T includes a debounced active-low manual reset input (MR) with internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset assertion, which remains active for 150ms after MR is released. The MR input rejects glitches as short as 100ns and requires a minimum pulse width of 1µs. This feature is explicitly documented for MAX6385 in the Selector Guide and Pin Description sections of the MAX6381–MAX6390 datasheet.

What is the package type and pin count of the MAX6385XS44D7-T?

The MAX6385XS44D7-T is packaged in a lead(Pb)-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. This is confirmed in the Ordering Information table, where "XS" denotes the 4-pin SC70 variant, and the pin configuration diagram on page 9 shows pins labeled VCC, RESET, MR, and GND in standard SC70 top view orientation.

What are the reset timeout periods supported by the MAX6385XS44D7-T?

The MAX6385XS44D7-T supports two independent reset timeout periods: a 1200ms minimum timeout after VCC recovery (VCC reset timeout) and a 150ms minimum timeout after manual reset release (MR timeout). These values are defined by the "D7" suffix in the part number and verified in the Reset Timeout Delay table and MAX6390-specific notes on page 7 and 8 of the datasheet, which state "MAX6390_ _D7 → 1200/150ms*" and confirm MAX6385 shares the same D7 timing option per ordering guide.

Is the MAX6385XS44D7-T qualified for automotive applications?

No, the MAX6385XS44D7-T is not automotive-qualified. While it operates over -40°C to +125°C and is AEC-Q100 qualified *within specific /V trim versions*, the "-T" suffix and absence of "/V" in the part number indicate the commercial-grade version. Automotive variants (e.g., MAX6385XS44D7/V+T) are explicitly listed separately in the Ordering Information table with "/V" designation and require factory ordering - the MAX6385XS44D7-T itself is rated for industrial temperature range only.